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Old 09-11-2009, 07:15 PM   #1
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what spark plugs do i need

ok i have a 03 mustang gt i just recently installed some sparkplugs autozone said would be best for my car not sure what they were ill take one out tomorrow and say what it is but here goes im gonna list my mods and you tell me what would be best bet for what i have

03 mustang gt mods as follows
diablosport tuner tune
cai
i think 75mm tb (not to sure of the size 2nd hand part from a fiend) w/upper plenum
160* thermostat
electric waterpump
u.d. pulleys
4.10 gears
aluminum driveshaft
mid length headers
xpipe with cats
stock exhaust pipes w/o mufflers (cut off) i dunno if its hurting my hp and tq
250 amp alternator
blaster cop kit
and optima yellow top

what should i use and could the spark plugs neing the wrong kind for that setup be a reason for my car to just shut of when im going into a turn going 15-25

also what shouldbe the next poweradders i put on
besides heads and cams and f/i
getting heads and cams when i can afford em
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Old 09-11-2009, 08:39 PM   #2
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Re: what spark plugs do i need

Mustang's seem to run the best with Motorcraft (or Autolite) spark plugs. I have heard of people having problems when they use other plugs. You just have basic bolt on's so you don't need a special plug. If you are doing heads and cams you should do an intake manifold and some exhaust work to get all that extra air out. To finish it off, get the car tuned on a dyno to get the most potential out of your mods.
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Old 09-12-2009, 12:48 AM   #3
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Re: what spark plugs do i need

Motorcraft/Autolite Platinums. Those are the factory plugs and will work best for you.
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Old 09-13-2009, 05:05 PM   #4
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Re: what spark plugs do i need

I tried Zex plugs and the motor kept missing so long story short just stick with stock Motorcraft.
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Old 09-14-2009, 01:59 AM   #5
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Re: what spark plugs do i need

I bought the Iridium spark plugs and they work great except for 4th gear about 50mph and the engine shakes but every other range is great. stick with stock
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Old 09-14-2009, 08:25 AM   #6
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Re: what spark plugs do i need

yea I would put the OEM ones in it gaped correctly (CHECK GAP!) and tq to specifications with antiseeze
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Old 09-14-2009, 09:23 PM   #7
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Re: what spark plugs do i need

I have e3 diamond fire, so far so good only have a few thousand on them gas mileage unsure know more in few week, but made in china !
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